Date: Sun, 27 Feb 2005 16:16:30 -0500 From: Josh Elsasser <josh@elsasser.org> To: Ian Dowse <iedowse@maths.tcd.ie> Cc: freebsd-mobile@freebsd.org Subject: Re: Using VESA to restore display settings on resume Message-ID: <20050227211630.GX2702@jade.elsasser.org> In-Reply-To: <200502270431.aa10917@salmon.maths.tcd.ie> References: <200502270431.aa10917@salmon.maths.tcd.ie>
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--1Wg5Vd7si6EhrIHA Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Feb 27, 2005 at 04:31:25AM +0000, Ian Dowse wrote: >=20 > It's possible that the experimantal patch below may help on some > notebooks where the display does not recover from a suspend-resume > cycle. It makes use of the VESA BIOS to save the display settings > before the system suspends and then restores them on resume. The > patch is against -CURRENT, but might apply against RELENG_5 without > too much trouble. >=20 > I have a JVC laptop here where this is the only way I have found > so far to bring the LCD back to life after resuming, so maybe it > will help on other systems too. >=20 > To test it, apply the patch and rebuild your kernel + modules. You > need to either have 'options VESA' in the kernel config or else > load the vesa module. It may also be worth trying with the > hw.acpi.reset_video sysctl set to 0, since rerunning the VGA POST > should be unnecessary. >=20 > Ian >=20 > Patch also at: http://people.freebsd.org/~iedowse/vesa_restore.diff >=20 THANK YOU! I've had my laptop for 3 1/2 years, and I can finally suspend/resume and have a usable display afterwards! Cardbus doesn't appear to work after resume, but that's a whole different can of worms... The system I tested this on was RELENG_5 from yesterday, the patch applied cleanly. I already had the hw.acpi.reset_video set to 0, so I don't know if it would work with it set to 1. I would love to see this committed and MFC'd if it doesn't break things for anyone else. -jre --1Wg5Vd7si6EhrIHA Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iD8DBQFCIjiuz9XqP7gz/VARAisOAKDRmbF//P1Oifcz4xgSeUnLFBFQvACfRJ3A aQral45eK+bbEp+tUCbseyo= =z3hQ -----END PGP SIGNATURE----- --1Wg5Vd7si6EhrIHA--
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