https://bugs.freedesktop.org/show_bug.cgi?id=54484
Bug #: 54484
Summary: Thinkpad E525: LVDS und VGA do not turn back on after
suspend/resume
Classification: Unclassified
Product: xorg
Version: unspecified
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Driver/Radeon
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
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
accordingly.
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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