[Bug 93486] New: [HP Compaq dc7800 Small Form Factor PC] suspend/resume failure

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93486

            Bug ID: 93486
           Summary: [HP Compaq dc7800 Small Form Factor PC] suspend/resume
                    failure
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: urs_fleisch at yahoo.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Suspend to RAM fails, the PC will not wake up again. It only works if I suspend
to disk before, then I can suspend to RAM afterwards (as many times as needed)
until the PC is rebooted again.

The suspend to disk workaround no longer works on Ubuntu 15.10, but it still
works with Arch Linux and it worked with all Ubuntu versions I had on this PC,
i.e. Ubuntu 11.10, 12.04, 12.10, 13.04, 13.10, 14.04, 14.10, 15.04. I think
this information is still important as it shows that the PC can be brought into
a state where suspend to RAM works.

Another observation: The PC can resume from suspend to RAM if nomodeset is
added to the kernel cmdline, in which case,the screen isn't turned on after
resume but the PC reacts to keyboard and is able to reboot with ctrl-alt-del.

I reported this bug initially to Ubuntu at
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1375995, where it was
triaged to be a kernel bug https://bugzilla.kernel.org/show_bug.cgi?id=109811,
where they said this is a GPU driver issue. You can find additional information
in these two bug reports.

I checked if any remarkable differences between the state of Intel registers
can be observed (using intel_reg dump) in the case after reboot (where STR
fails) and the case after hibernation (where STR works), however, I could not
find any. Please tell me, if I can check anything else.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20151223/b211f854/attachment.html>