bug#22274: GuixSD resets hardware clock (on Lenovo x200 with libreboot)

[Christopher Allan Webber]

Christopher Allan Webber writes:

> Ludovic Courtès writes:
>
>> Christopher Allan Webber <address@hidden> skribis:
>>
>>> My config is attached.  Hackily, I copy-pasta'ed the kernel packages
>>> entirely from guix v0.9.0's release.  I can confirm that this can read
>>> the hardware clock just fine, whereas the other version of the kernel
>>> can't... so it does indeed look like between Linux-Libre 4.2.5 and
>>> Linux-Libre 4.3.3 we have some sort of regression that leads to this
>>> problem on x200 Minifree Libreboot-enabled laptops, at least.
>>
>> Great, thanks for narrowing it down.
>>
>> Given that, I think it would be useful to keep a copy of 4.2.5 in Guix
>> itself.  Would you like to provide a patch for that, preferably using
>> ‘(inherit linux-libre)’ rather than copying the whole recipe?
>>
>> Ludo’.
>
> Yes, I will work on this.

Here's a patch that does just this.  Does it look good enough to merge?

>From afcd19c4b3cf69ecacf2c34ba3051fc05c830879 Mon Sep 17 00:00:00 2001
From: Christopher Allan Webber <address@hidden>
Date: Sun, 17 Jan 2016 20:34:25 -0800
Subject: [PATCH] gnu: Add linux-libre-4.2.5

This older version of linux-libre is being added because it was found
that newer versions (or at least 4.3.3) of linux-libre were not reading
the hardware clock on (at least Libreboot-enabled) Thinkpad x200
machines.

* gnu/linux.scm (linux-libre-4.2.5): New variable.
---
 gnu/packages/linux.scm | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/gnu/packages/linux.scm b/gnu/packages/linux.scm
index 779b9c8..de4d1bd 100644
--- a/gnu/packages/linux.scm
+++ b/gnu/packages/linux.scm
@@ -317,6 +317,22 @@ It has been modified to remove all non-free binary blobs.")
     (license license:gpl2)
     (home-page "http://www.gnu.org/software/linux-libre/";))))
 
+;; This older version of linux-libre is being added because it was found
+;; that newer versions (or at least 4.3.3) of linux-libre were not reading
+;; the hardware clock on (at least Libreboot-enabled) Thinkpad x200
+;; machines.
+
+(define-public linux-libre-4.2.5
+  (package
+    (inherit linux-libre)
+    (version "4.2.5")
+    (source (origin
+             (method url-fetch)
+             (uri (linux-libre-urls version))
+             (sha256
+              (base32
+               "13ar9sghm2g5w2km9x2d07q3lh81rz286d6slklv56qanm24chzx"))))))
+
 
 ;;;
 ;;; Pluggable authentication modules (PAM).
-- 
2.1.4