29 lines
996 B
Markdown
29 lines
996 B
Markdown
|
# Known issues with Haswell
|
||
|
|
|
||
|
|
These issues are specific to the Haswell architecture. For a given
|
||
|
|
mainboard, there might be additional issues to those listed here.
|
||
|
|
|
||
|
|
## PCIe graphics
|
||
|
|
|
||
|
|
```eval_rst
|
||
|
|
Using a PCIe graphics card for display output is not currently
|
||
|
|
supported. This is because :doc:`./mrc.bin` requires workarounds to
|
||
|
|
have such a feature working correctly.
|
||
|
|
```
|
||
|
|
|
||
|
|
However, there is a [patch on Gerrit][hsw-gfx-gerrit] that allows PCIe
|
||
|
|
graphics to be used for display output. This patch is not guaranteed to
|
||
|
|
be of the same level of quality as code committed to coreboot.
|
||
|
|
|
||
|
|
Still, in some cases, a PCIe graphics card can be used for rendering,
|
||
|
|
while the integrated graphics device is used for display output. This
|
||
|
|
can be achieved under GNU/Linux by using [PRIME GPU offloading][PRIME].
|
||
|
|
|
||
|
|
## PCIe 3.0
|
||
|
|
|
||
|
|
Only PCIe 2.0 has been tested so far. PCIe 3.0 could potentially have
|
||
|
|
stability issues.
|
||
|
|
|
||
|
|
[PRIME]: https://wiki.archlinux.org/index.php/PRIME
|
||
|
|
[hsw-gfx-gerrit]: https://review.coreboot.org/c/30456
|