[Bug 102343] [CHT] Screen remains black after opening lid on Asus T102HA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102343

--- Comment #35 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to alfredovogel from comment #28)
> I have got news :
> I downgraded my BIOS from 303 to 300 by following a hint that adviced to
> type      'risky' on the window that ttells you the bios file is 'too old'.
> It reflashes the BIOS file 300.
> And wonderful, the lid close ,sleep and wake work really well.
> The two BIOS files are downloadable on the ASUS website as per this link:
> https://dlcdnets.asus.com/pub/ASUS/nb/T102HA/T102HAAS303.zip
> https://dlcdnets.asus.com/pub/ASUS/nb/T102HA/T102HAAS300.zip
> 
> I do not know how to compare the two files, so that I cannot say what has
> changed.
> 

There are three VBTs in each file, first two seem identical but the third has
significant changes in the MIPI sequence block (and a small tweak to the panel
timings).

But I can't say which of the three is actually used. You'd need to boot with
each and take a dump of /sys/kernel/debug/dri/0/i915_vbt

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