[Bug 54484] New: Thinkpad E525: LVDS und VGA do not turn back on after suspend/resume

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Sep 4 01:13:59 PDT 2012


             Bug #: 54484
           Summary: Thinkpad E525: LVDS und VGA do not turn back on after
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: hcb at chaoticmind.net
         QAContact: xorg-team at lists.x.org

Symptom: After resuming from "suspend to ram", the internal display remains
black. The machine is responsive otherwise (ssh).

Tested with stock 3.2 and 3.5 kernels. Also, not yet fixed as of 3.6rc3 (here,
radeon kms driver does not work at all).

System is Thinkpad E525 with A4-3300M.

Further experiments revealed that the VGA connector is affected in the same
way, but I found the following interesting twist: when the kms fb driver only
powers the LVDS, while the VGA connector is activated only while the X server
is in control, then the VGA comes back to life after resume. (I have not yet
found an easy way to let kms fb not drive the LVDS to test whether this also
works the other way round; my hope is that this would be the case).

Traces show some differences in the modesetting sequence between VGA being
driven (see below), I have tried but so far failed to hack up radeon kms

Note: this is *probably* the same bug as #43829, but I do not want to
intermingle the logs and traces with reports on different hardware.

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