On Fri, 12 Sep 2014 13:57:20 +1000 Dave Airlie <airl...@gmail.com> wrote:
> Got an bug report from someone using a silicon motion video card in > VGA mode about corruption that they tracked down to 64-bit memory > operations not being supported by the video card, it appears that we > probably shouldn't be using > 32-bit copies on VGA memory. VGA memory is write combining usually so the answer in general would be no. You may also find its a combination of bridge and card and one or the other is somehow out of spec. > The include/linux/vt_buffer.h defaults scr_memcpyw defaults to using > memcpy, which on 64-bit x86 machines ends up as rep movsq. Is there > any way to make this use a 32-bit memcpy instead? Please don't - you'll reduce performance for everyone else with saner video cards. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/