https://bugzilla.kernel.org/show_bug.cgi?id=33512
Summary: radeon: lots of time spent in atombios_crtc_disable
Product: Drivers
Version: 2.5
Kernel Version: 2.6.39-rc3
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
AssignedTo: drivers_video-...@kernel-bugs.osdl.org
ReportedBy: edwinto...@gmail.com
Regression: No
Created an attachment (id=54532)
--> (https://bugzilla.kernel.org/attachment.cgi?id=54532)
dmesg
On a mostly idle system this is what I see with perf top (after exiting a
game):
---------------------------------------------------------------------------
PerfTop: 386 irqs/sec kernel:72.8% exact: 0.0% [1000Hz cycles],
(all, 6 CPUs)
---------------------------------------------------------------------------
samples pcnt function DSO
_______ _____ ______________________________
171.00 18.0% atombios_crtc_disable
/lib/modules/2.6.39-rc3-phenom-00117-ge38f5b7/kernel/drivers/gpu/drm/radeon/radeon.ko
47.00 4.9% find_next_bit [kernel.kallsyms]
31.00 3.3% format_decode [kernel.kallsyms]
When playing a game that function is still on top, albeit with a lower
percentage (7.5%).
If the function does what its name says then it should be called at most once,
when switching modes, entering standby, etc. I don't see why it is being called
during normal operation, and why is it called so many times that it makes it
the top function using the CPU...
The graphics in games is quite laggy too, maybe because of this...
My dmesg is attached.
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