Thanks all for your help and suggestions. I'll summarise what further
testing I've done:
I believe 3D acceleration is working. `glxgears` runs and seems to
achieve a smooth 60 Hz. The __memcpy_sse2_unaligned load doesn't seem
to increase due to running glxgears.
glxgears -info reports:
GL_RENDERER = Gallium 0.4 on ATI R420
GL_VERSION = 2.1 Mesa 10.3.2
GL_VENDOR = X.Org R300 Project
Perhaps interestingly, `glxinfo -i` reports:
name of display: :0.0
X Error of failed request: BadValue (integer parameter out of range for
operation)
Major opcode of failed request: 155 (GLX)
Minor opcode of failed request: 24 (X_GLXCreateNewContext)
Value in failed request: 0x0
Serial number of failed request: 56
Current serial number in output stream: 59
I'm not using anything fancy in terms of desktop environment: just the
Notion (formerly Ion3) window manager plus a few accessories.
Running `dpkg -S /lib/firmware/radeon/R420_cp.bin` returns:
dpkg-query: no path found matching pattern /lib/firmware/radeon/R420_cp.bin
Not sure where that firmware file would have originated from...it's
possible I copied it from elsewhere when I first installed Jessie and
forgot that I'd done it!
`lspci | grep -i vga`:
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
[AMD/ATI] R420 [Radeon X800 XT Platinum Edition AGP]
`lsmod | grep video` returns nothing, but I do have the following:
radeon 1345162 2
ttm 77862 1 radeon
drm_kms_helper 49210 1 radeon
drm 249955 5 ttm,drm_kms_helper,radeon
Out of curiosity, I did try installing firmware-linux-nonfree, and `dpkg
-S /lib/firmware/radeon/R420_cp.bin` now reports:
firmware-linux-nonfree: /lib/firmware/radeon/R420_cp.bin
After rebooting, the sluggish redrawing and excessive time spent in
Xorg/__memcpy_sse2_unaligned is still there. :(
Thanks again!
Chris
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