I'm running Ubuntu 12.04 on a Lenovo ThinkPad T500. When I close the lid, the system keeps running, although all open applications are killed. If I choose, say, "Hibernate" from the shutdown menu (I'm using Cinnamon), the screen blanks to a console, which then fills with messages like:
It turns out that device 00:0a is PNP0c31 (whatever that may be!). Sometimes after the error message the system will shutdown for a second, only to spring back into life immediately (that is, before a lid close/lid open cycle). Currently the only way I can be sure of successfully saving power is by turning off the machine with its power switch.
radeon 0000:01:00.0 GPU lockup CP stall for more than ... msec
dpm_run_callback(): pnp_bus_resume+0x0/0x70 returns -19
PM: device 00:0a failed to retore: error -19
It would appear that the issue is somehow related to the graphics driver, so what is my best option here? FWIW, the command "lspci -v | grep VGA" returns
and "lsmod | grep radeon" returns
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV635 [Mobility Radeon HD 3650] (prog-if 00 [VGA controller])
Any help would be very gratefully received!
radeon 832167 1
ttm 76326 1 radeon
drm_kms_helper 47459 2 i915,radeon
drm 240232 7 i915,radeon,ttm,drm_kms_helper
i2c_algo_bit 13317 2 i915,radeon