Date: Wed, 28 Jan 2015 01:23:26 -0600 From: "Andrew Wilcox" <AWilcox@Wilcox-Tech.com> To: "'Ranjan1018 .'" <214748mv@gmail.com> Cc: 'freebsd-current' <freebsd-current@freebsd.org> Subject: RE: drm2 regression: backlight adjustment on ivybridge no longer works Message-ID: <009501d03acb$4f380d70$eda82850$@Wilcox-Tech.com> In-Reply-To: <CACyC=qZeG8L%2BbZu=RacU_rdNVTFhyCFH2A%2BdNw71%2B09cZ20VgA@mail.gmail.com> References: <CAJ-VmomfBrBN6HVBq5FoRf1nRqvrhiDOw6RHjfs13j-9cqi1vg@mail.gmail.com> <CACyC=qYMT3VFx4GxypJ6F61pKSaxE0JKBK%2BudDMPSh4_ASAi6w@mail.gmail.com> <000e01d039fb$d5959930$80c0cb90$@Wilcox-Tech.com> <CACyC=qZeG8L%2BbZu=RacU_rdNVTFhyCFH2A%2BdNw71%2B09cZ20VgA@mail.gmail.com>
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Ranjan1018 . sent: 27 January 2015 23:42: > The regression was introduced in r277487. Looking closer at this revision, I believe I may see the issue. Most of = the new tunables introduced in dev/drm2/i915/i915_drv.c are = uninitialised and thus probably contain junk. It likely works for me = because the firmware of my laptop 0s memory on EFI boot. I have uploaded a diff here that I believe may fix this. Please test = and let me know: http://foxkit.us/FreeBSD/i915-uninitialised-var-fix.diff Best, Andrew -- Andrew Wilcox, C/C++/Python developer, kernel hacker Blog: http://blog.foxkit.us/ WWW: http://foxkit.us/ GitHub: https://github.com/awilfox
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