<html><head></head><body><div style="color:#000; background-color:#fff; font-family:bookman old style, new york, times, serif;font-size:10px"><div id="yui_3_16_0_ym19_1_1484919239954_5564" dir="ltr"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5708">I just installed 32-bit Xubuntu LTS 16.04 Xenial Xerus on a partition of my MacBook Pro 1,2 with a 2.16 GHz Intel Core Duo processor and 2GB 667 MHz DDR2 SDRAM. The brightness is fine at startup and during use, but after sleep the screen is very dark; I could barely see the screen asking me to enter my password, couldn't read anything else, had to use the power button to shut down. How can I set my computer so that it wakes up with reasonable screen brightness? I don't think it's a hardware issue; the computer wakes up brightly when running Mac OS X on the other partition. I've also seen online posts from Xubuntu users with different hardware reporting the same problem. </span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5709"><br><br>Here are the fixes I've tried so far:</div><div id="yui_3_16_0_ym19_1_1484919239954_5564" dir="ltr"><br id="yui_3_16_0_ym19_1_1484919239954_5710"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5711">I thought it might be a brightness problem, since the F1 and F2 keys did not control screen brightness.I did the following:</span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5712"><br>1:<br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5713"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5714">Code: sudo leafpad /etc/default/grub</span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5715"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5716">Changed: GRUB_CMDLINE_LINUX=""</span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5717"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5718">...to read: Code: GRUB_CMDLINE_LINUX="acpi_backlight=vendor" </span></div><div id="yui_3_16_0_ym19_1_1484919239954_5564" dir="ltr"><span style="background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5790">Saved file.<br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5719"></span><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5721"> Code: sudo update-grub</span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5722"><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5725"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5726">...After this the brightness control worked from the keyboard while the computer was staying awake after startup, but waking from sleep continued to be very dark and the keyboard commands did not increase brightness.</span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5727"><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5728"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5729">2.</span></div><div id="yui_3_16_0_ym19_1_1484919239954_5564" dir="ltr"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5974">I tried changing settings in Power Manager under Settings, switching the 'sleep' and 'hibernate' actions from Lock Screen to Suspend; I saw no difference.</span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5730"><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5731"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5732">3:</span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5733"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5734">sudo apt-get update</span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5735"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5736">sudo apt-get install xfce4-power-manager light-locker-settings</span><br style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1484919239954_5737"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5738">Light Locker appeared in my Settings, but when I click on the icon it didn't actually open a control panel--the icon just sat there. </span><br></div><div id="yui_3_16_0_ym19_1_1484919239954_5564" dir="ltr"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);"><br></span></div><div id="yui_3_16_0_ym19_1_1484919239954_5564" dir="ltr"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5851">4:</span></div><div id="yui_3_16_0_ym19_1_1484919239954_5564" dir="ltr"><span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif; font-size: 13px; background-color: rgb(243, 243, 243);" id="yui_3_16_0_ym19_1_1484919239954_5862">rm</span><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; color: rgb(51, 51, 51);" id="yui_3_16_0_ym19_1_1484919239954_5843"> ~/.config/autostart/light-locker.desktop</span></div><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; background-color: rgb(235, 236, 228);" id="yui_3_16_0_ym19_1_1484919239954_5844">I did that and got a message saying </span><br style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px;" id="yui_3_16_0_ym19_1_1484919239954_5846"><font color="#333333" style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px;" id="yui_3_16_0_ym19_1_1484919239954_5847">rm: cannot remove '/home/lorraine/.config/autostart/light-locker.desktop': No such file or directory.</font><div id="yui_3_16_0_ym19_1_1484919239954_5907"><font color="#333333" style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px;"><br></font></div><div id="yui_3_16_0_ym19_1_1484919239954_5906" dir="ltr"><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; background-color: rgb(235, 236, 228);" id="yui_3_16_0_ym19_1_1484919239954_5947">How do you decide whether to keep trying fixes, reinstall what you had before, or try another distro?</span><br style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px;" id="yui_3_16_0_ym19_1_1484919239954_5948"><br style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px;" id="yui_3_16_0_ym19_1_1484919239954_5949"><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; background-color: rgb(235, 236, 228);" id="yui_3_16_0_ym19_1_1484919239954_5950">If keeping trying seems indicated: Some fixes start with going into 'system settings' and changing settings in a window I've not yet found. I can go into Settings, and thence into Power Manager, but that doesn't offer the exact options shown in the fixes. How should I access system settings, if they're separate from Settings?</span><font color="#333333" style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px;"><br></font></div><div id="yui_3_16_0_ym19_1_1484919239954_5906" dir="ltr"><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; background-color: rgb(235, 236, 228);"><br></span></div><div id="yui_3_16_0_ym19_1_1484919239954_5906" dir="ltr"><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; background-color: rgb(235, 236, 228);" id="yui_3_16_0_ym19_1_1484919239954_6061">Also, so far as I kow I don't have a swap partition configured. My Mac now has 3 partitions: 100 GB running Mac OS X (only using 20 GB at present), 50 GB running Xubuntu (very little of that used), 10 GB free space. I thought the swap partition was probably not important because I am not running near capacity on either of the established partitions, but I could be wrong; if so, how should I set up a swap partition on a Mac?</span></div><div id="yui_3_16_0_ym19_1_1484919239954_5906" dir="ltr"><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; background-color: rgb(235, 236, 228);"><br></span></div><div id="yui_3_16_0_ym19_1_1484919239954_5906" dir="ltr"><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; background-color: rgb(235, 236, 228);" id="yui_3_16_0_ym19_1_1484919239954_5960">Any advice greatly appreciated. As you can see, I'm a raw newbie and realize I may be missing something obvious. Thanks for taking time to read this.</span></div><div id="yui_3_16_0_ym19_1_1484919239954_5906" dir="ltr"><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; background-color: rgb(235, 236, 228);"><br></span></div><div id="yui_3_16_0_ym19_1_1484919239954_5906" dir="ltr"><span style="font-family: Ubuntubeta, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 13px; line-height: 15px; background-color: rgb(235, 236, 228);">Joanna</span></div></div></body></html>