Contributed by johan on from the can-haz-X11-support dept.
Marc Balmer (mbalmer@) writes about his endeavors into amd-geode graphics that has given us support for the amd-geode-lx gpu in X11.Marc writes:
Marc continues below...
Earlier this week I reported that X runs on AMD Geode LX graphics processors using the 'vesa' driver. Well, there is some good news: The accelerated 'geode' driver now works as well and X runs quite a bit faster with it.
Thanks Marc for taking your time and telling us about this.
The accelerated X driver requires access to so-called model specific registers (MSR) found in AMD CPUs. Since these are available in kernel mode only, I first had to write the amdmsr(4) driver which allows a userland process running as root to read or write MSR registers. For security reasons, this is only allowed when 'allowaperture' is set.
For more information on the driver, look at /usr/xenocara/driver/xf86-video-geode/README.
Be aware that the driver still has some rough edges, especially mode selection seems not to work in all cases as desired. In that case, please use the vesa driver instead.
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