[Bug 40205] Since Breezy, vga=0x317 hangs in resume after suspend to disk

[Jörg Höhle]

Public bug reported:

Affects: linux-source-2.6.12 (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed


Description:
Using vga=0x317 boot option works fine in Hoary, but breaks with Breezy
upon resuming from suspend to disk mode.

In case you didn't know, a line like
nonaltoptions=vga=0x317 quiet nosplash
in /boot/grub/menu.lst or a modification of the
"kernel /boot... vga=0x317" line allows to benefit from resolutions  like 127x60 console text mode in a 1024x768 display.  This is very handy, and 80x25|43 is so limiting.
Furthermore, some laptops are not able to scale the 80x25 mode, so there are huge black borders around the text area.

When restarting the system, everything goes normally at first. But after
some time, the resume process just freezes, displaying the following
messages:

[screen is cleared, shown output starts at top of screen]
[4294768.653000] Stopping tasks: ====================================...
[4...          ] Freeing memory... done (37204 pages freed)
[4...          ] GTM info ... [2 times]
[4...          ] ACPI PCI interrupt ... disabled [3 times]
[4...          ] resume= option should be used to set suspend device.................................swsusp: Need to copy 36549 pages

vga=0x317 is why I could not reproduce Bug #25551: I had not realized that this vga=xyz change caused the difference in behaviour.
vga=0x317 works in Breezy when booting normally. The bug only shows after suspend to disk.
Happens with both with linux-image-2.6.12-9 and -10

Regards,
 Jörg Höhle

-- 
Since Breezy, vga=0x317 hangs in resume after suspend to disk
https://launchpad.net/bugs/40205