[Bug 591699] [NEW] Lenovo Thinkpad x100e freezes when X blanks screen

[Brian Candler]

Public bug reported:

[Moved from #535653. I have no problem with X starting up, but only when
X blanks screen]

Machine is a Lenovo Thinkpad X100e model NTS5EUK:
AMD Turion(tm) Neo X2 Dual Core Processor L625 stepping 02
+ 2GB RAM, internal WLAN (realtek) and WWAN (Gobi 2000) cards. BIOS version reported is 1.21. Originally I had turned on the AMD virtualisation extensions in the BIOS, but I've now switched this back, so BIOS is at defaults including

    Config > CPU > AMD V(TM) Technology = Disabled
    Security > Memory Protection > Exection Protection = Enabled

In #535653 I reported this problem with amd64, but I've now installed
i386 from scratch with exactly the same behaviour.

The laptop is connected to an Ethernet LAN and a USB CD-ROM. I have not
configured wireless at all.

I can reproduce the problem as follows.
* Install Lucid 10.4 desktop i386 from CD
* apt-get update && apt-get dist-upgrade && apt-get install openssh-server
* echo "options radeon modeset=0" > /etc/modprobe.d/radeon-kms.conf
* cat >/etc/X11/xorg.conf
    Section "ServerFlags"
    Option "BlankTime" "1"
    EndSection
* reboot, let it come up to the gdm screen, then don't touch it

>From another machine on the same LAN, copy a large file using scp, e.g.
    scp ubuntu-10.04-desktop-i386.iso brian at x.x.x.x:/var/tmp/

You can also periodically check the network health from another window:
    while date && ssh brian at x.x.x.x hostname; do sleep 9; done

What happens is: after 1 minute the X screen blanks. At this very
instant, the laptop network connection freezes: the scp session stalls,
and the laptop won't respond to ping. Moving the trackpoint, the screen
comes back to life, but then the laptop is in a very fragile state and
soon crashes. For example, pressing Ctrl-Alt-F1 usually freezes it
instantly. Selecting "reboot" from the power menu will start the reboot
process, but leave it frozen on a blank purple screen (possibly at the
point of changing video mode again?). At this point the machine has to
be hard powered off by pressing and holding the power button.

Extra data points:
* Login, open a terminal and type "xset s noblank" then repeat the test: the machine does NOT freeze. (I get a big "X" and a chequerboard pattern instead of the screen being fully blanked).

I think this all suggests that the X blanking is the culprit, although
it's not clear why the machine should stop talking to ethernet instantly
but continue along in a crippled state otherwise. (Interrupts?)

I did previous testing with amd64, recorded under #535653, but I have not repeated these tests with i386 yet. I found that:
* leaving the screen in text mode (via ctrl-alt-F1) does not crash, even if the text mode screen blanks
* installing fglrx driver didn't make a difference

Also, I was able to reproduce the problem on the train this morning on
battery. All of the rest of my tests have been with mains connected.

There are two warning messages which flash up while the machine boots, I
think they are these two lines from dmesg:

[   11.310661] shpchp 0000:00:01.0: Cannot reserve MMIO region
[   11.764446] thinkpad_acpi: Not yet supported ThinkPad detected!

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-22-generic 2.6.32-22.36
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  brian      1395 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xd0600000 irq 16'
   Mixer name	: 'Conexant CX20582 (Pebble)'
   Components	: 'HDA:14f15066,17aa21b2,00100302'
   Controls      : 12
   Simple ctrls  : 10
Date: Wed Jun  9 12:32:46 2010
HibernationDevice: RESUME=UUID=8506a093-2f4a-42b5-a0b3-fedceb946b13
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: LENOVO 35085EG
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=750a8dc7-cec8-4a9d-bf77-4963ad9827e9 ro quiet splash
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34
RfKill:
 
SourcePackage: linux
dmi.bios.date: 03/26/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6XET37WW (1.21 )
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6XET37WW(1.21):bd03/26/2010:svnLENOVO:pn35085EG:pvrThinkPadX100e:rvnLENOVO:rnINVALID:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 35085EG
dmi.product.version: ThinkPad X100e
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug graphics i386 lucid needs-upstream-testing xorg-needs-kernel-fix

-- 
Lenovo Thinkpad x100e freezes when X blanks screen
https://bugs.launchpad.net/bugs/591699
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