Date: Mon, 23 Mar 2015 09:09:47 -0400 From: Adam McDougall <mcdouga9@egr.msu.edu> To: Glen Barber <gjb@FreeBSD.org> Cc: freebsd-current@freebsd.org Subject: Re: Broadwell Support FreeBSD 10.1 Message-ID: <5510109B.7070205@egr.msu.edu> In-Reply-To: <20150322234900.GI13428@hub.FreeBSD.org> References: <550F50F6.7060306@marspolar.com> <20150322234900.GI13428@hub.FreeBSD.org>
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On 03/22/2015 19:49, Glen Barber wrote: > On Sun, Mar 22, 2015 at 04:32:06PM -0700, Marek Novotny wrote: >> New to this group, and new to FreeBSD via PC-BSD. Really like it so far. >> Sorry if this has been asked to death already. Levono has their new T450 >> with the 5th gen intel Broadwell i5 processor. I bought it with the hopes of >> running PC-BSD latest version on it. It uses intel 5500 graphics as well. >> Any potential issues using this?? >> > > You won't be able to use accelerated graphics. > > I have the T540p which has the i7-4800MQ, and am quite happy with > running FreeBSD CURRENT on it. I don't care about accelerated graphics > too much, though. > > One nit with the laptop is I needed to use an external USB flash drive > to store /boot on an MBR partition, because my hard drives are > GPT-partitioned using ZFS on '/' on GELI-encrypted providers. > Otherwise, I have noticed that using the /boot on the GPT disk enforces > low resolution graphics (640x480 IIRC). > > By using a USB flash drive for /boot, I can get 1920x1080 resolution > (one of the many reasons for choosing this laptop). > > (I've been meaning to put this into the FreeBSD Wiki, but EBUSY.) > > Glen > Glen, in the past I briefly tested the uefi bootloader on a Lenovo T440s including with scfb and I believe the default resolution would raise to native if I also disabled CSM mode in the "bios". This affected the console mode as well as scfb which both inherit the framebuffer from the uefi GOP as I understand it. Have you tried that? You should be able to demonstrate it while booted from a uefi boot stick, no permanent system changes necessary. I've also been looking forward to see if this trick works with uefi since xf86-video-scfb performance was perfectly usable on a uefi booted mac but not the lenovo: https://forums.freebsd.org/threads/xorg-vesa-driver-massive-speedup-using-mtrr-write-combine.46723/
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