Public bug reported:
With ums (nomodeset kernel parameter) this laptop suspends to ram just
fine. However ums seems deprecated nowadays and we don't have direct
rendering anymore:
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/946677
With the default kms, during resume from suspend I'm getting:
[drm:r100_ring_test] *ERROR* radeon: ring test failed
(scratch(0x15E4)=0xCAFEDEAD)
[drm:r100_cp_init] *ERROR* radeon: cp isn't working (-22).
afterwards the log and VTs are flooded with
[drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(4).
[drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB !
The graphic is frozen but looks intact and the mouse pointer moves. It's
possible to change to VTs.
>From this state, a reboot hangs somewhere down the line shortly after the
>plymouth splash appears and looks normal.
Interestingly this can be rescued by pm-hibernate from the console.
After waking up from hibernate the X session continues as if nothing went wrong
in between.
I tried with 3.4.0-030400-generic-pae from kernel-ppa/mainline, it
doesn't flood the logs anymore but the first two errors and the frozen
graphic is the same.
Attached is the syslog of a hibernate suspend hibernate cycle and lspci
-vvvxxxx before, during and after.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1029159
Title:
kms radeon drm: suspend freezes graphics, hibernate reinits ok
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