On mer., 2013-09-11 at 08:45 +0000, Matthew Garrett wrote:
On Wed, 2013-09-11 at 11:45 +0300, Jani Nikula wrote:
Before plunging forward, have you observed any difference between the boot modes? We have reports [1] that the backlight behaviour is different with UEFI vs. UEFI+CSM or legacy boot. So I'm wondering if the acpi_gbl_osi_data >= ACPI_OSI_WIN_8 check in patch 2/2 is the whole story.
Further, if we tell the BIOS we're Windows 8 to use the tested BIOS code paths, what guarantees do we have of UEFI+CSM or legacy boots working?
We have no evidence of Windows behaving differently based on the exposed firmware type.
I do have an X230 which boots fine using pure UEFI or UEFI+CSM (and I guess I can try booting it with a grml for pure legacy), so I can do tests if needed.
Regards,